An introduction to Extruder feeding equipment

In order to improve the feeding efficiency of the extruder, mechanical devices are usually used for auxiliary feeding. Commonly used auxiliary feeding methods include: screw feeding, stirring feeding, force feeding, pellet feeding, etc.

Screw feeding

Twin screw feeders can be used for feeding most bulk materials such as pigments, powders, fiberglass, etc. Screw feeders are the most common and economical volumetric feeders. Haisi supply screw volumetric feeders in a wide range of sizes to meet your different extruder models and solve your material handling problems.

Stirring feeding

Stirring feed is suitable for crushed materials, such as cleaned woven bag waste silk and film crushed materials.

Force feeding

The crushed materials are sent into the storage bin through the air conveying device. There is a stirring device in the storage bin to prevent materials from bridging. The material is controllably transported to the forced pressing silo through the screw conveyor on the storage bin, and then the material is fed into the extruder screw through the forced pressing screw.

Pellet feeding

The cutting compactor and the extruder are effectively combined. The transported materials enter the cutting compactor chamber to complete crushing, mixing, drying and pelletizing. The pelletized materials are thrown into the extruder screw by high-speed centrifugal force.

Material characteristics that affect feeding performance:

Free-flowing: Plastic pellets are generally free-flowing materials and generally do not require special design or additional flow enhancement when fed by gravity.

Free-flowing: Plastic pellets are generally free-flowing materials and generally do not require special design or additional flow enhancement when fed by gravity.

Stickiness: Some materials tend to pile up like snowballs, and they require flow aids, such as internal stirring, air sweeping, or air cushions to create movement and external vibration to break up the clumps. For such situations, adding cross lines at the end of the feed pipe can help the material enter the threads of the feeding screw better.

Hygroscopicity: Materials with this property retain moisture easily. Customers often report that materials are left in the feeder only to find that they have solidified the next day. This is because the material absorbs moisture from the environment. Placing the material in clean, dry air or N2 can effectively avoid such problems.

Pressure Sensitive: In large capacity extended hoppers, these materials are easily stacked, and smaller feeds will produce better results. Additionally, if using a feeder that agitates a flex-walled hopper via external paddles, close attention will need to be paid to the frequency level at which the paddles agitate the hopper walls, as higher frequency agitation or vibration often causes these materials to pile up.

Low Melt Temperature: These materials tend to decompose, melt or char when subjected to excessive friction or energy. Application engineers recommend using a larger diameter feed screw running at a lower RPM when processing such materials, rather than a smaller diameter feed screw running at a higher RPM.

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